Home / 128,740.13-177,672.31-72,162.44

Finding the Fourth Proportional to 128,740.13, 177,672.31 and 72,162.44

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Solution

The fourth proportional to 128,740.13, 177,672.31 and 72,162.44 is: 99,590.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,740.13 : 177,672.31 = 72,162.44 : x
  2. Step 2: Convert to fraction form
    128,740.13/177,672.31 = 72,162.44/x
  3. Step 3: Cross multiply
    128,740.13x = 177,672.31 × 72,162.44
  4. Step 4: Simplify right side
    128,740.13x = 12,821,266,341.27
  5. Step 5: Solve for x
    x = 12,821,266,341.27/128,740.13
  6. Step 6: Final answer
    x = 99,590.29

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.